Tack pointed flanged joint fastener



Nov. 7, 1933. J. 5'. MOCHESNEY 1,934,134

TACK POINTED FLANGED JOINT FASTENER Filed May 23. 1929 f7 @IiI-IIIIIIIIIII Ml? enzor' Patented Nov. 7, 1933;

UNITED STATES PATENT OFFICE 2 Claims.

The invention is a tack-pointed divergent flanged joint fastener, the object in view being to so improve the construction as to result in drawing together two pieces of wood or other 5 material into which the fastener is adapted to be driven, to impart to the penetrating edge of the fastener such formation as will insure the easy driving of the fastener either with or across the grain of the wood and with practically no tendency to deflection from a straight line in the driving operation and to impart to the side flanges thereof such formation as will provide added strength thereto against failure un der tension.

One of the important features of my new fastener is the provision of a blunt scalloped driving end, and V shaped scalloped beveled cutting edges on the penetrating end, the points thereof extending across the fastener and in the medial plane of the relatively very thin central web; tapered upset converging side flanges at the sides of the web terminating short of the driving and penetrating ends, said flanges preferably of lozenge shape in cross section.

In the use of flanged nails such as joint nails or clamp nails, it has been the practise heretofore to provide a saw kerf or saw cut to receive the relatively thick central web of the flanged fastener said web being of I shaped cross section; in the fastener of my invention, the scalloped beveled web and the lozenge shaped flanges thereof are of such thinness that they may be driven directly into the material to be fastened without previous preparation of the abutting joints to r ceive the web.

The fastener constituting the present inven tion is formed from a continuous strip of flat wire by first cutting or notching out small sec-- tions from the opposite sides thereof, whereby the continuous length is divided into sections, each section constituting a nail; the edges of the vdre intermediate the notched out portions are swaged in such manner as to form continuous converging side flanges widerat the penetrating end than at the driving end, the faces of said flanges presenting a wedge shaped appearance narrower at the penetrating end than at the driving end. Said flanges forming very thin beveled cutting edges of lozenge shaped cross section adapted to penetrate the wood or other material of the joint to which the nail is to be applied and thereby aid in embedding the nail in the structure.

The serrated cutting edge of the flat web penetrates the material to be joined easily and cleanly without unnecessary crowding'of the fibres and prior to the entrance of. the divergent flanges into the material forming the abutting joints.

The completed fastener is produced from a continuous strip of flat wire by co-acting severing means positioned so that the point of severance extends across the face of the wire from notch to notch and intermediate the upset side flanges, the co-acting severing means forms a .blunt serrated'terminal end on the previously notched and swaged portion of the continuous length of flat wire which terminal end of the wire thereafter becomes the driving end'of the nail next succeeding and forms a corresponding scalloped beveled or tack-pointed penetrating end on the completed nail. I v

The notchingout, swaging and severing operations, may be performed step by step, but are preferably performed simultaneously, there by producing a completed nail in one operation. Another object of my invention is to provide means whereby the fastener may be severed from a continuous length of flatjwire without injury to the upset side flanges thereof by providing notched out registered portions along' the continuous length of flat wire for the receipt of cutting means intermediate theside flanges thereof, thereby permitting the severing means to cut cleanly across the web of the fastener without distorting or injury to the side flanges.

It has been the practise heretofore, and as disclosed in my application Number 290,354-Joint nails, to provide side flanges with flat faces so that. a section taken through the medial portion of the fastener presents an I-shaped ap-' pearance. .When fasteners of this type are subjected to severe t'ensional strains the flanges bend backwards in the direction of the disrupting forces. In the fastener of my new invention, I-have provided flangesoflozenge shape cross sectionon the sides of the web, thus increasing the strength of the flange so that it isequal to or greater than the material comprising the objects to be joined. This construction of the side flanges is of such shape that they are easily entered into the abutting pieces of wood without injury thereto.

In the accompanying drawing I have shown one embodiment of the invention but the con-v struction shown therein is illustrative, only, and not as defining the limits of the invention. The drawing shows, moreover, the simple method of making lozenge flanged tack-pointed fasteners.

Figure 1 is a plan view'of the notched andswaged strip or length of sheet metal forming a series of blanks adapted for the manufacture of fasteners in accordance with this invention.

Fig. 2 is a view of the notched out and lozenge flanged edge thereof.

Fig. 3 represents the improved lozenge flanged tack pointed joint fastener in side elevation.

Fig. 4 is an end view of Fig. 3.

Fig. 5 is a perspective view of the completed fastener.

Fig. 6 is a cross section of the fastener in perspective taken on line 3-3 of Fig. 2.

Fig. '7 is an enlarged top plan view illustra tive of the scalloped driving end and lozenge shaped side flanges.

Fig. 8 is an enlarged sectional view of the penetrating end taken on line 44 of Fig. '7.

Fig. 9 is a partial view of the nail in perspec tive positioned as it would appear in practise with respect to the abutting pieces of wood or other material beforethecommencement of the driving operation.

Fig. 10 represents the position of the co-acting severing element H with respect to the notched out portion "of the central web of the fastener.

Fig. 11 is acompanion co-acting severing element.

As shown 'the fastener is made from a continuous length of sheet metal of uniform cross section, reference being had to Figure 1 "the continuous length X Y comprises a central web W and plurality of notched out sections N, oppositely spaced on the edges of the web and at predetermined distances along the edges thereof, converging upset lozenge shaped flanged F extending on the opposite sidesof the medial plane of the central web, said flanges being narrower on the face thereof on the penetrating end than at. the driving end and converging'with respect "toward the plane of the'web'from the penetrating end toward the driving end, imparting a wedge shaped appearance to the central web W intermediate the notches. I

As shown in Fig. 3 the penetrating end C is provided with beveled or V shaped serrated tack pointsC', and a "blunt serrated driving end E at the ends of the web W, the driving end E penetrating end C extending an appreciable distance beyond the upset side flanges F.

The flat central web W intermediate side flanges F has a wedge shaped appearance "and said web extends an appreciable 'distance beyond the side flanges F forming a sharpenedserrated entering end and a blunt serrated "driving end.

The edges of the web on sides thereofare inclined at a--b so that the webis 'narrowerat the driving end E than at the penetrating end C, the transverse edges of the penetrating end C are beveled onopposite faces thereof producing a'serrated sharp cutting edge C extending from notch N to notch N across the lateral plane of the web and at an appreciable distance beyond the side flanges F at the penetrating end as more clearly illustrated in the enlarged view, Fig. 8. It is essential that the penetrating end C of the flanged joint fastener be provided with a serrated sharp cutting edge C, said edge C lying in the medial plane of the fastener.

That part of the web W formed by the notched out portions N at the penetrating end of the nail, merges into and terminates short of the swaged faces'of the lozenge shaped side flanges F, whereas at the driving end the notched out portions N of the web lie flush with and merge into the swaged tapered portions of the flanges F as is clearly illustrated, particularly in Fig. 3, Fig. 472.1111 Fig. 5. The penetrating end C and the cutting edge C extending across the entire width of the web W presents a thin sharp penetrating edge across the medial line of the fastener and the thin smooth upset lozenge shaped side flanges present sharp cutting faces at right angles to the medial line of the nail, thus the entire penetrating end is free of a blunt web surface which would tend-to deflect the nail from a straight line during the driving operation, by causing WOOd'flbIQ or other material 'to be forced outwardly and to pile up in advance of the nail during the driving operation.

Having thus described the invention, I claim: 1. A joint fastener comprising a transverse web of relatively thin metal having a blunt driving end and a sharp cutting penetrating end, said web on the side edges thereof having cutting flanges of lozenge cross section increasing in cross section area progressively from the enter-- I ing to the driving end; said flanges adapted to cut their way thru and to imbed themselves into the material of the joint to prevent retrograde movement and to strengthen the web so to resist deformation thereof during the driving of the fastener.

2. A joint fastener comprising a flat web, cutting flanges of lozenge cross section increasing in cross section area from the penetrating to the driving end and arranged along opposed longitudinal sides thereof, the width of the web increasing progressively from the driving to the entering end of the fastener, a sharpened tongue projecting forwardly in prolongation of the fastener beyond the forward extremity of the flanges, the width of the tongue being substantially'equal to the opposed inner sides of the flanges at their point of greatest divergence,

the forward edge of the pilot tongue being beveled to provide a cutting edge, the length of which is substantially equal to the maximum width of the web; said cutting flanges of lozenge cross sectionadapted to compress the material ofthe joint intermediate thereof and to draw the'abutting surfaces into forced fixed relation and to stiffen the flat web to resist bending thereof during the driving of the fastener. JOHN SHERMAN MCCHESNEY. 

